[COMMITTED] libdwfl: dwfl_module_getdwarf.c don't use symtab with bogus sh_entsize.

[Mark Wielaard]

Those will cause a divide by zero. We have no way to know what size the
entries are.

Signed-off-by: Mark Wielaard <m...@redhat.com>
---
 libdwfl/ChangeLog              | 5 +++++
 libdwfl/dwfl_module_getdwarf.c | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/libdwfl/ChangeLog b/libdwfl/ChangeLog
index 78314c4..22bc783 100644
--- a/libdwfl/ChangeLog
+++ b/libdwfl/ChangeLog
@@ -1,3 +1,8 @@
+2014-11-14  Mark Wielaard  <m...@redhat.com>
+
+       * dwfl_module_getdwarf.c (load_symtab): Don't use tables which have
+       a zero sh_entsize.
+
 2014-11-10  Mark Wielaard  <m...@redhat.com>
 
        * dwfl_module_getdwarf.c (find_dynsym): New inner function
diff --git a/libdwfl/dwfl_module_getdwarf.c b/libdwfl/dwfl_module_getdwarf.c
index adb94b4..a20875b 100644
--- a/libdwfl/dwfl_module_getdwarf.c
+++ b/libdwfl/dwfl_module_getdwarf.c
@@ -575,6 +575,8 @@ load_symtab (struct dwfl_file *file, struct dwfl_file 
**symfile,
        switch (shdr->sh_type)
          {
          case SHT_SYMTAB:
+           if (shdr->sh_entsize == 0)
+             break;
            symtab = true;
            *symscn = scn;
            *symfile = file;
@@ -589,6 +591,8 @@ load_symtab (struct dwfl_file *file, struct dwfl_file 
**symfile,
            if (symtab)
              break;
            /* Use this if need be, but keep looking for SHT_SYMTAB.  */
+           if (shdr->sh_entsize == 0)
+             break;
            *symscn = scn;
            *symfile = file;
            *strshndx = shdr->sh_link;
-- 
1.8.3.1